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Old 17th March 2011, 09:29 AM   #31
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Hi again,

just another thought: You do know that you can use the 1660 as plate choke? Just connect the primary and leave the secondary floating. Not ideal, but for a quick test more than ok. If you like it, get a 1668 or 1667

Best regards

Thomas
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Old 17th March 2011, 09:40 AM   #32
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I read that the Tango is 70H inductance. I'm surprised it sounds better than the LL1660, which must be over 150H even in 1:1, particularly if the LL1660 then sounds better in 4.5:1.

What's going on here besides inductance?

Andy
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Old 17th March 2011, 09:54 AM   #33
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Hi Andy,

there is much more than primary inductance which has an influence on the overall result. The primary inductance determines the bass roll of frequency. Just increasing the inductance endlessly would create other problems like increased winding capacitance and impact high frequency roll off. Tango generally tends to concentrate on a wider bandwidth in the treble.

4.5:1 is a totally different application than 1:1 so this is not really comparable. The 1660 can only be sensibly compared to the Tango when it is configured 1:1.125 (or the other way around). In this configuration the Tango sounds and measures better than the Lundahl.

Thomas
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Old 17th March 2011, 10:10 AM   #34
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I am in contact with AE-Europe in the Netherlands to make a custom build #26 HighEnd plate to line Transformer.
  • 15K:600Ohm nominal Z ratio
  • 200H prim. / 8-10ma DC prim. current
  • 250Vdc max. prim. voltage
  • doulbe C-Core (amorph or permalloy)
  • max. bandwith (in the window of 10-70 kHz @-3dB or better)
  • good shielded
  • copper and silver sec. possible

Lets see what they could do for the #26 community
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Old 17th March 2011, 10:59 AM   #35
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Don't focus too much on these absolute inductance specifications.
The values measured with inductance meters, especially in the case of grain oriented silicon steel, give merely an approximation of what is really going on.
I would say that another spec, DCR of windings, is also very important (copper losses).
Compare two chokes (or IT's) with the same inductance and DC current capability, but different DCR's, and I bet you'd prefer the lower DCR one.
For DCR I try to go not over 10% of the tube Rp.
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Old 17th March 2011, 11:04 AM   #36
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Quote:
Originally Posted by dvb-projekt View Post
[*]max. bandwith (in the window of 10-70 kHz @-3dB or better)
Keep on dreaming...
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Old 17th March 2011, 11:46 AM   #37
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Thanks Pieter, that's a helpful insight. Your expertise is appreciated!

I like the idea of a "26 community". Since I don't know of any finer small tube and since fortunately they made loads of them it would be good to think that we might at last have a voice. We might be drowned out by the 12AX7 community but at least we could be "a contender"....

Andy
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Old 17th March 2011, 11:54 AM   #38
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Quote:
Originally Posted by pieter t View Post
Keep on dreaming...
If Bartolucci could make it for all their Preamp. Transformers.....

Click the image to open in full size.

...i think AE-Europe could do it also.
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Old 17th March 2011, 12:04 PM   #39
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With a 5:1 transformer, primary inductance at least 150H, 15mA or so DC current capability, and a 7k source impedance (26 tube) you will not reach 70 kHz minus 3 dB.
When so, go to Japan and help to tame the nuclear power plants because you can what nature does not allow.
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Old 17th March 2011, 12:13 PM   #40
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Quote:
Originally Posted by pieter t View Post
With a 5:1 transformer, primary inductance at least 150H, 15mA or so DC current capability, and a 7k source impedance (26 tube) you will not reach 70 kHz minus 3 dB.
When so, go to Japan and help to tame the nuclear power plants because you can what nature does not allow.
Puhh... Why so agressive

I share only my ideas to the wanted transformer. If AE said the frequency window is smaller, its also ok.

Im only trying to get an non compromise OPT for me and the #26 community, thats all!

BTW, i find your comment about Japan not funny!
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Last edited by dvb projekt; 17th March 2011 at 12:21 PM.
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